[Cerowrt-devel] 10GigE nics and SFP+ modules?

dpreed at reed.com dpreed at reed.com
Wed Sep 10 15:31:09 EDT 2014

I'm confused....
SFP is not SFP+.   SFP carries at most 4.25 Gb/sec.   SFP+ works at >10 Gb/sec.   So, it's not clear that the MikroTik is very useful in a 10 Gig world.  It's not immediately clear but VERY likely, that this is an "edge switch" that is intended for collapsing the GigE copper traffic onto a potentially bottlenecked GigE "local backbone".
Of course if you want to go from GigE fiber to GigE copper, that board might be useful.

On Wednesday, September 10, 2014 2:05pm, "Dave Taht" <dave.taht at gmail.com> said:

> On Wed, Sep 10, 2014 at 12:01 AM, Mikael Abrahamsson <swmike at swm.pp.se>
> wrote:
> > I don't like when people create their cable plant to match what GPON needs.
> > It's done because of the illusion that long-haul fiber is expensive. It
> > isn't, if you have to dig anyway. The difference in cost of a 12 fiber
> > cable, and a 1000 fiber cable, isn't huge compared to the digging costs.
> > Splicing a 1000 fiber cable isn't huge either. Point-to-point fiber cabling
> > is the way to go. If you then decide to light it up using PON of some kind,
> > fine, that's up to you, at least you have the flexibility to change
> > technology in the future.
> >
> >> and several costs there have dropped significantly, routerboard is
> >> making a SFP+ capable
> >> 5 port switch for like 50 dollars
> >
> >
> > URL?
> Nick weaver (of ICSI) just turned me onto them -
> http://www.cloudrouterswitches.com/RB260GS.asp?gclid=Cj0KEQjw7b-gBRC45uLY_avSrdgBEiQAD3Olx8_iFXJ_xKjZInc2T54XEu5VyMsTe42Rla3GTRKrkwwaAu2M8P8HAQ
> He also steered me to a nifty port mirroring POE passthrough device:
> http://www.dual-comm.com/gigabit_port-mirroring-LAN_switch.htm
> Haven't tried either yet, personally.
> It turns out that both he and I are using the nearly same model nucs
> for load testing, with a standard 2.5inch sata 3 slot, and 2 mini pcie
> slots for a half length and full length wifi device.
> "The D54250WYK1, which is a dual core, dual thread/core i5 based with
> 16 GB Ram and a 120 GB SSD). The only disadvantage is it doesn't
> include the "Vpro" lights out management suite present in the 3rd gen
> model."
> I am using the i3 versions. I'd written up a review of the one without
> the 2.5 inch slot here:
> http://snapon.lab.bufferbloat.net/~cero2/nuc-to-puck/results.html
> and later upgraded to the one with the slot, as sata is faster than
> msata, and the best wifi (atheros ath9k and ath10k) cards are all full
> length).
> These have e1000e cards in them, which support BQL under linux 3.6 and
> later, and although the (i3 at least) can't drive gigE to saturation
> without TSO, they have been quite nice and quite quiet so far, and
> have been giving solid results. They are a really good desktop, too,
> under linux, and mounting them on the back of the monitor (or, as I
> do, on a pegboard), is helpful too.
> >
> > --
> > Mikael Abrahamsson email: swmike at swm.pp.se
> --
> Dave Täht
> https://www.bufferbloat.net/projects/make-wifi-fast
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